Method for forming heating coils



Je 36', 1 w. L. ENGHAUSER 3 METHOD FOR FORMING HEATING COILS OriginalFil ed Dec. 5, 1938 3 Sheets-'Sheet 1 INVENTOR.

Jame 30, 1942. w. L. ENGHAUSE-R 2,288,273

METHOD FOR FORMING HEATING COILS Original Filed Dec. 5, 1938 5Sheets-Sheet 2 57 INVENTOR. 4474 12 We Wm? ATTORNEYS June 30, 1942. w.L. ENGHAUSER METHOD FOR FORMING HEATING COILS Original Filed Dec. 5,1938 3 Sheets-Sheet 3 BY W igs v.

WM'WATTORNEYJ k gum" Patented June 30, 1942 2 UNITED STAT 2,288,273 7METHOD FOR FORMING HEATING ooiLs Winford L. Enghauser, Cincinnati,hio,.assignor to The-Production Plating Works, Inc; Lebanon, Ohio, acorporation of Ohio I Original application December 5, 1938, Serial ,No.

243,908. Divided and this application November 17, 1939, Serial No.304,984

7 1 Claim. 01. 153-33) This invention relates to the art of bending orFigure 7 is a sectional view taken on line 1-1,. forming lengths oftubing and isparticularly di- Figure 5, further detailing the releasemecharected to a method of bending a length of pipe nisrn. into the formsuitable for a water coil, specifical- Figure 8 is a sectional viewtaken on line 8--8, 1y providing a reversely bent length of tubing 5.Figure 1, detailing a portion ofthe lower die. having parallel runs andadjacent terminal Generally described,the apparatus consists of ends. Itis desirable to extend the amount of a stationary die having a'ro'cking'die pivoted passageway so that the water has a greater thereon,and an upper die adapted to descend travel in the zone of heat. For thisreason, upon the pipe for forcing the pipe between the the tube is bentso as to provide an enlarged or 10 stationary die and the rocking" dieand causing flared bight. the rocking die, by virtue of its rock-ingmotion,

The formation of a coil of this shape presents to form the coil aroundthe forming wheel of unusual problems in the art of bending. One thedescending die. of the first considerations is reduction in theSpecifically referring to the drawings, the apnumber of steps requiredin the formation. The paratus consists of a base or pedestal Ill. Thecoil must sell inexpensively and it is therefore lower die support orcontinuation of the base is desirable that the number of steps bereduced indicated at H. The stationary die I2, is fitted to a minimum tosave costs of production. Also in a recess in the inner side wall of thethroat the tubing must be supported efiiciently during l3 of the diesupport II. Specifically, the die elethe bending so as to' prevent wallcollapse. ment I2 consists of an angular base, the top arm It has beenthe object of the present inventor of which rests on the top surface ofthe die supto provide a method of bending a length of tubport. This dieelement is removable for intering into a complete coil of the generalshape changementl- A separate-die element for each herein described. Itis a further object to acsize of tubing is employed. A semi-circularcomplish the formation of the coil in a single groove [4, formed on theradius of the particuoperation or pass. A structure, used in this lartubing, extends along the top arm and the method, mayconsist of athroated die, including side arm of the die and feathers out at the basea rocking die actuated by the motion of a deof the vertical arm.scending forming die as it passes into the throat A bracket i5, forsupporting the length of the of the lower die for bending the pipearound the pipe, is fixed against the side of the support formingelement of the descending die to form and provides a horizontal arm, thetop surface the enlarged bight and for disposing the runs in of whichlies in the plane of the base of the close proximity. semi-circulargroove I4. This arm has a stop This application is divisional of mypreviously l6 adjustably fixed thereon by means of a set filedapplication, Serial No. 243,908, filed Descrew ll. The length of tubing,indicated at l8, cember 5, 1938, directed to apparatus for formhas oneend engaged against this stop It. ing the coil. The rocking die I9 isconstituted by a bell Other objects and certain advantages Will becrank,'which is pivoted on a pivot pin 20. One more fully apparent in adescription of the acarm of the bell crank extends upwardly andcompanying drawings in which: 40 carries a forming wheel 2|, whichincludes a Figure 1 is the front view of the coil forming semi-circulargroove 22, formed on the radius apparatus of this invention. of theparticular tubing, wherein the wheel is Figure 2 is a fragmentary viewtaken similar in the form of a sheave. When this wheel is in to Figure 1but showing the apparatus in posiupward position, the straight length ofpipe will tion after forming the length of tubing into a resttangentially in the groove since the base of coil. the groove is in thesame plane as the base of Figure 3 is a side view of the apparatus. thegroove of the stationary die.

Figure 4 is an enlarged sectional view taken The horizontal arm of thebell crank carries on line 44, Figure 1, illustrating the details anactuating wheel 23. This wheel is grooved in of the top die. the samemanner as the wheel 2|. The wheel Figure 5 is an enlarged fragmentaryview of a is disposed directly in the path of the descending portion ofFigure 3, further detailing the die. die or, more specifically, the pipepressed down- Figure 6 is a view taken similar to Figure 5, wardly underthe die. The bell crank is held in but showing the release mechanismthereof opthe position as described above by means of a coil erated forremoving the finished coil. to spring 24 under tension between a pin 25on the vertical arm and a pin 26 fixed on a stop element 21 attached tothe side of the support ll. Thebell crank carries a stop 28 engaged withstop 21 when the rocking die is in position prior to descent-of theupper die.

The details of the die actuating mechanism are not shown since they areconventional. The lower end of the ram 29 includes an attachment fiange30. The carrier bracket 3| for the upper forming wheel 32, includes anattaching flange 33 corresponding to that of the ram and attachedthereto by means of screws 34. The downwardly extending portion of thebracket 3| includes the forming wheel 32 attached against its side bymeans of a stud 35. The forming wheel 32 is of the same type as theWheel 2i but is split centrally of its thickness, that is, at rightangles to its axis. The stud is fixed rigidly in position and the wheelsections are loosely mounted on the stud.

The outer section 36 of the wheel is shiftable along the stud by meansof a lever 31. The handle 38 of the lever is screwed into one arm of abell crank 39, which is bifurcated and pivoted on the outer end of thestud 35 on a pin 40. The other arm of the bell crank is connected to thewheel by means of a link 4|. For this purpose, the wheel section 36includes spaced ears extending longitudinally of the stud at each sidethereof. The link elements 4! in each instance, are attached to theinner side of the ears 42 by means of screws 43. The screws afford apivotal connection since they are screwed into the ears and looselyengage the links. The same arrangement is provided for attaching thelinks to the bifurcated arm of the bell crank, the screw, in thisinstance, being indicated at 44.

Thus, when the pivot 40 and the screws 43 and 44 are aligned along theaxis of the stud, the sections of the wheel are held together asindicated in Figure 5. In this position, inward movement of the lever 31is limited by means of a set screw 46 traversing a cross piece 41 of thebell crank lever and held in position by means of a nut 48 whereby theset screw will engage the stud (see Figure '7) when the wheel is readyfor the forming operations.

The ram is held in spaced relation with respect to the stationary dieand against any spreading tendency by means of a roller 50 carried by anarm 5| fixed to the carrier for the upper forming wheel. This rollerrides along the outer surface of a guide bar 52 fixed vertically to therear face of the base II.

An adjustable stop 55 is fixed to the ram and includes a wheel 56appropriately grooved and adapted to be engaged by the run of tubingwhen the ram reaches the lower end of its stroke for maintaining theformed run in strictly vertical position (see Figure 2).

When the forming wheel is in the position shown in Figure 6, thefinished coil may be slid downwardly, assuming, of course, that the ramhas been raised. The runs 51 of the coil are spaced sufficiently topermit traversal with respect to the stud 35.

Having described my invention, I claim:

The method of forming a pipe structure consisting of the steps of:supporting a length of pipe toward its respective ends, engaging theintermediate and unsupported portion of the pipe by means of a formingroll, moving said forming roll downwardly to produce a reverse bendwhile supporting one of the runs by a lateral supporting surfacedisposed parallel with the movement of the roll and spaced therefrom bythe diameter of the pipe, maintaining said one run supported asaforesaid and further moving said roll downwardly and simultaneouslyexerting a bending force on the other run to bend it further about theroll to createan offset loop, and engaging said last named run above theroller during formation of the loop to obtain a predetermined spacingbetween the upper portions of the runs.

WINFORD L. ENGHAUSER.

